Gaya APA

Galactic Astronomy. (1970). New York: [s.n.].

Gaya Chicago

Galactic Astronomy. . New York: [s.n.], 1970. Text.

Gaya MLA

Galactic Astronomy. . New York: [s.n.], 1970. Text.

Gaya Turabian

Galactic Astronomy. New York: [s.n.], 1970. Print.